How to adjust the left hand menu

General questions
#1

Dear all,
is it possible to adjust the left hand menu (Dashboard to Marketplace)?
I.e to hide “Visitors” or one of is sub menu links?

I am aware that this must be possible for Marketplace, but found no hint, that this possible for the others as well.

#2

You can disable marketplace plugin, or by developing a custom UI Theme.

#3

Yes I’am aware of that. But my question actually concerns the other left hand menu points.
Is there a solution / configuration for them available?